I am no expert , and I use a survival necklace/lanyard as a Just- in-case emergency item.

In every kit , I have a emergency necklace within the kit. When emergncy hits, I take out the necklace and wear it ASAP, and put the items in front pocket or under shirt for safety purposes and to to gaurd against unwated attention.

My emergency laynards are made from ID lanyards ( they are usually worn in conferences ..etc.) I removed the ID card , and add some carabiner or D ring, then add a whistle, tiny flashlight, and a tiny minitool.

They are on-person backup, but there is always a real thing in my bag and more in the office locker or vehicle glove compartment.

YMMV